new HomeButtonViewModel(scene, durationopt)
    The view model for 
    HomeButton.
Parameters:
| Name | Type | Attributes | Description | 
|---|---|---|---|
| scene | Scene | The scene instance to use. | |
| duration | Number | <optional> | The duration of the camera flight in seconds. | 
Members
command :Command
    Gets the Command that is executed when the button is clicked.
    Type:
duration :Number|undefined
    Gets or sets the the duration of the camera flight in seconds.
A value of zero causes the camera to instantly switch to home view.
The duration will be computed based on the distance when undefined.
    Type:
- Number | undefined
scene :Scene
    Gets the scene to control.
    Type:
tooltip :String
    Gets or sets the tooltip.  This property is observable.
    Type:
- String